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  if (localStorage.getItem("token") === null) {
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<html lang="en">
  <head>
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    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
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    <link rel="stylesheet" href="./assets/lib/layui/css/layui.css" />
    <link rel="stylesheet" href="./assets/css/index.css" />
    <title>Document</title>
  </head>

  <body class="layui-layout-body">
    <div class="layui-layout layui-layout-admin">
      <div class="layui-header">
        <div class="layui-logo">
          <img src="./assets/images/logo.png" alt="" />
        </div>
        <!-- 头部区域（可配合layui已有的水平导航） -->

        <ul class="layui-nav layui-layout-right">
          <li class="layui-nav-item">
            <a href="javascript:;">
              <span class="user-avatar">L</span>
              <img src="http://t.cn/RCzsdCq" class="layui-nav-img" />
              个人中心
            </a>
            <dl class="layui-nav-child">
              <dd><a href="javascript:;">基本资料</a></dd>
              <dd><a href="javascript:;">更换头像</a></dd>
              <dd><a href="javascript:;">重置密码</a></dd>
            </dl>
          </li>
          <li class="layui-nav-item">
            <a id="logout" href="javascript:;"
              ><i class="layui-icon layui-icon-logout"></i>退出</a
            >
          </li>
        </ul>
      </div>

      <div class="layui-side layui-bg-black">
        <div class="layui-side-scroll">
          <div class="userinfo" href="javascript:;">
            <span class="user-avatar">L</span>
            <img src="http://t.cn/RCzsdCq" class="layui-nav-img" />
            &nbsp;欢迎你&nbsp;<span class="username"></span>
          </div>
          <!-- 左侧导航区域（可配合layui已有的垂直导航） -->
          <ul
            class="layui-nav layui-nav-tree"
            lay-filter="test"
            lay-shrink="all"
          >
            <li class="layui-nav-item layui-this">
              <a href="./index.html"
                ><i class="layui-icon layui-icon-home"></i>首页</a
              >
            </li>
            <li class="layui-nav-item">
              <a class="" href="javascript:;"
                ><i class="layui-icon layui-icon-form"></i>文章管理</a
              >
              <dl class="layui-nav-child">
                <dd>
                  <a href="./article/category.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>类别管理</a
                  >
                </dd>
                <dd>
                  <a href="./article/list.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>文章列表</a
                  >
                </dd>
                <dd>
                  <a href="./article/add.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>添加文章</a
                  >
                </dd>
              </dl>
            </li>
            <li class="layui-nav-item">
              <a href="javascript:;"
                ><i class="layui-icon layui-icon-username"></i>个人中心</a
              >
              <dl class="layui-nav-child">
                <dd>
                  <a href="./user/userinfo.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>基本资料</a
                  >
                </dd>
                <dd>
                  <a href="./user/repwd.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>重置密码</a
                  >
                </dd>
                <dd>
                  <a href="./user/avatar.html" target="fm"
                    ><i class="layui-icon layui-icon-app"></i>更换头像</a
                  >
                </dd>
              </dl>
            </li>
          </ul>
        </div>
      </div>

      <div class="layui-body">
        <!-- 内容主体区域 -->
        <!-- <div style="padding: 15px">内容主体区域</div> -->
        <iframe src="./home/dashboard.html" name="fm" frameborder="0"></iframe>
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      <div class="layui-footer">
        <!-- 底部固定区域 -->
        © layui.com - 底部固定区域
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    <script src="./assets/js/common.js"></script>
    <script src="./assets/js/index.js"></script>
  </body>
</html>
